Astronomy STEM lesson - What is a megamaser?
Megamaser (spacetelescope.org)

Lola Gayle, STEAM Register This galaxy, known as IRAS 16399-0937, may look serene, but appearances can be deceiving. The galaxy, located over 370 million light-years from Earth, is actually a rare megamaser, which are astrophysical objects that emit intense radio waves and are found near the center of some galaxies. Megamasers are intensely bright, around 100…